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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]          
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax     $ 1.7    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax     (47.0)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax     (3.3)    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax     (1.5)    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (50.9)   (50.9)   $ (51.8)
Foreign currency translation (2.0) $ 1.2 (2.3) $ 0.7  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     1.5    
Other Comprehensive Income (Loss), Net of Tax     0.9    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (45.3)   (45.3)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (5.6)   (5.6)    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 0.0   0.0    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (50.9)   $ (50.9)   $ (51.8)